authfile.c

   1 /*
   2  * Author: Tatu Ylonen <ylo@cs.hut.fi>
   3  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
   4  *                    All rights reserved
   5  * This file contains functions for reading and writing identity files, and
   6  * for reading the passphrase from the user.
   7  *
   8  * As far as I am concerned, the code I have written for this software
   9  * can be used freely for any purpose.  Any derived versions of this
  10  * software must be clearly marked as such, and if the derived work is
  11  * incompatible with the protocol description in the RFC file, it must be
  12  * called by a name other than "ssh" or "Secure Shell".
  13  *
  14  *
  15  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
  16  *
  17  * Redistribution and use in source and binary forms, with or without
  18  * modification, are permitted provided that the following conditions
  19  * are met:
  20  * 1. Redistributions of source code must retain the above copyright
  21  *    notice, this list of conditions and the following disclaimer.
  22  * 2. Redistributions in binary form must reproduce the above copyright
  23  *    notice, this list of conditions and the following disclaimer in the
  24  *    documentation and/or other materials provided with the distribution.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  27  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  28  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  29  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  30  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  31  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  35  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include "includes.h"
  39 RCSID("$OpenBSD: authfile.c,v 1.60 2004/12/11 01:48:56 dtucker Exp $");
  40
  41 #include <openssl/err.h>
  42 #include <openssl/evp.h>
  43 #include <openssl/pem.h>
  44
  45 #include "cipher.h"
  46 #include "xmalloc.h"
  47 #include "buffer.h"
  48 #include "bufaux.h"
  49 #include "key.h"
  50 #include "ssh.h"
  51 #include "log.h"
  52 #include "authfile.h"
  53 #include "rsa.h"
  54 #include "misc.h"
  55
  56 /* Version identification string for SSH v1 identity files. */
  57 static const char authfile_id_string[] =
  58     "SSH PRIVATE KEY FILE FORMAT 1.1\n";
  59
  60 /*
  61  * Saves the authentication (private) key in a file, encrypting it with
  62  * passphrase.  The identification of the file (lowest 64 bits of n) will
  63  * precede the key to provide identification of the key without needing a
  64  * passphrase.
  65  */
  66
  67 static int
  68 key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
  69     const char *comment)
  70 {
  71         Buffer buffer, encrypted;
  72         u_char buf[100], *cp;
  73         int fd, i, cipher_num;
  74         CipherContext ciphercontext;
  75         Cipher *cipher;
  76         u_int32_t rnd;
  77
  78         /*
  79          * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
  80          * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
  81          */
  82         cipher_num = (strcmp(passphrase, "") == 0) ?
  83             SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;
  84         if ((cipher = cipher_by_number(cipher_num)) == NULL)
  85                 fatal("save_private_key_rsa: bad cipher");
  86
  87         /* This buffer is used to built the secret part of the private key. */
  88         buffer_init(&buffer);
  89
  90         /* Put checkbytes for checking passphrase validity. */
  91         rnd = arc4random();
  92         buf[0] = rnd & 0xff;
  93         buf[1] = (rnd >> 8) & 0xff;
  94         buf[2] = buf[0];
  95         buf[3] = buf[1];
  96         buffer_append(&buffer, buf, 4);
  97
  98         /*
  99          * Store the private key (n and e will not be stored because they
 100          * will be stored in plain text, and storing them also in encrypted
 101          * format would just give known plaintext).
 102          */
 103         buffer_put_bignum(&buffer, key->rsa->d);
 104         buffer_put_bignum(&buffer, key->rsa->iqmp);
 105         buffer_put_bignum(&buffer, key->rsa->q);        /* reverse from SSL p */
 106         buffer_put_bignum(&buffer, key->rsa->p);        /* reverse from SSL q */
 107
 108         /* Pad the part to be encrypted until its size is a multiple of 8. */
 109         while (buffer_len(&buffer) % 8 != 0)
 110                 buffer_put_char(&buffer, 0);
 111
 112         /* This buffer will be used to contain the data in the file. */
 113         buffer_init(&encrypted);
 114
 115         /* First store keyfile id string. */
 116         for (i = 0; authfile_id_string[i]; i++)
 117                 buffer_put_char(&encrypted, authfile_id_string[i]);
 118         buffer_put_char(&encrypted, 0);
 119
 120         /* Store cipher type. */
 121         buffer_put_char(&encrypted, cipher_num);
 122         buffer_put_int(&encrypted, 0);  /* For future extension */
 123
 124         /* Store public key.  This will be in plain text. */
 125         buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
 126         buffer_put_bignum(&encrypted, key->rsa->n);
 127         buffer_put_bignum(&encrypted, key->rsa->e);
 128         buffer_put_cstring(&encrypted, comment);
 129
 130         /* Allocate space for the private part of the key in the buffer. */
 131         cp = buffer_append_space(&encrypted, buffer_len(&buffer));
 132
 133         cipher_set_key_string(&ciphercontext, cipher, passphrase,
 134             CIPHER_ENCRYPT);
 135         cipher_crypt(&ciphercontext, cp,
 136             buffer_ptr(&buffer), buffer_len(&buffer));
 137         cipher_cleanup(&ciphercontext);
 138         memset(&ciphercontext, 0, sizeof(ciphercontext));
 139
 140         /* Destroy temporary data. */
 141         memset(buf, 0, sizeof(buf));
 142         buffer_free(&buffer);
 143
 144         fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 145         if (fd < 0) {
 146                 error("open %s failed: %s.", filename, strerror(errno));
 147                 buffer_free(&encrypted);
 148                 return 0;
 149         }
 150         if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=
 151             buffer_len(&encrypted)) {
 152                 error("write to key file %s failed: %s", filename,
 153                     strerror(errno));
 154                 buffer_free(&encrypted);
 155                 close(fd);
 156                 unlink(filename);
 157                 return 0;
 158         }
 159         close(fd);
 160         buffer_free(&encrypted);
 161         return 1;
 162 }
 163
 164 /* save SSH v2 key in OpenSSL PEM format */
 165 static int
 166 key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
 167     const char *comment)
 168 {
 169         FILE *fp;
 170         int fd;
 171         int success = 0;
 172         int len = strlen(_passphrase);
 173         u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
 174         const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
 175
 176         if (len > 0 && len <= 4) {
 177                 error("passphrase too short: have %d bytes, need > 4", len);
 178                 return 0;
 179         }
 180         fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 181         if (fd < 0) {
 182                 error("open %s failed: %s.", filename, strerror(errno));
 183                 return 0;
 184         }
 185         fp = fdopen(fd, "w");
 186         if (fp == NULL ) {
 187                 error("fdopen %s failed: %s.", filename, strerror(errno));
 188                 close(fd);
 189                 return 0;
 190         }
 191         switch (key->type) {
 192         case KEY_DSA:
 193                 success = PEM_write_DSAPrivateKey(fp, key->dsa,
 194                     cipher, passphrase, len, NULL, NULL);
 195                 break;
 196         case KEY_RSA:
 197                 success = PEM_write_RSAPrivateKey(fp, key->rsa,
 198                     cipher, passphrase, len, NULL, NULL);
 199                 break;
 200         }
 201         fclose(fp);
 202         return success;
 203 }
 204
 205 int
 206 key_save_private(Key *key, const char *filename, const char *passphrase,
 207     const char *comment)
 208 {
 209         switch (key->type) {
 210         case KEY_RSA1:
 211                 return key_save_private_rsa1(key, filename, passphrase,
 212                     comment);
 213                 break;
 214         case KEY_DSA:
 215         case KEY_RSA:
 216                 return key_save_private_pem(key, filename, passphrase,
 217                     comment);
 218                 break;
 219         default:
 220                 break;
 221         }
 222         error("key_save_private: cannot save key type %d", key->type);
 223         return 0;
 224 }
 225
 226 /*
 227  * Loads the public part of the ssh v1 key file.  Returns NULL if an error was
 228  * encountered (the file does not exist or is not readable), and the key
 229  * otherwise.
 230  */
 231
 232 static Key *
 233 key_load_public_rsa1(int fd, const char *filename, char **commentp)
 234 {
 235         Buffer buffer;
 236         Key *pub;
 237         struct stat st;
 238         char *cp;
 239         int i;
 240         size_t len;
 241
 242         if (fstat(fd, &st) < 0) {
 243                 error("fstat for key file %.200s failed: %.100s",
 244                     filename, strerror(errno));
 245                 return NULL;
 246         }
 247         if (st.st_size > 1*1024*1024) {
 248                 error("key file %.200s too large", filename);
 249                 return NULL;
 250         }
 251         len = (size_t)st.st_size;               /* truncated */
 252
 253         buffer_init(&buffer);
 254         cp = buffer_append_space(&buffer, len);
 255
 256         if (read(fd, cp, (size_t) len) != (size_t) len) {
 257                 debug("Read from key file %.200s failed: %.100s", filename,
 258                     strerror(errno));
 259                 buffer_free(&buffer);
 260                 return NULL;
 261         }
 262
 263         /* Check that it is at least big enough to contain the ID string. */
 264         if (len < sizeof(authfile_id_string)) {
 265                 debug3("Not a RSA1 key file %.200s.", filename);
 266                 buffer_free(&buffer);
 267                 return NULL;
 268         }
 269         /*
 270          * Make sure it begins with the id string.  Consume the id string
 271          * from the buffer.
 272          */
 273         for (i = 0; i < sizeof(authfile_id_string); i++)
 274                 if (buffer_get_char(&buffer) != authfile_id_string[i]) {
 275                         debug3("Not a RSA1 key file %.200s.", filename);
 276                         buffer_free(&buffer);
 277                         return NULL;
 278                 }
 279         /* Skip cipher type and reserved data. */
 280         (void) buffer_get_char(&buffer);        /* cipher type */
 281         (void) buffer_get_int(&buffer);         /* reserved */
 282
 283         /* Read the public key from the buffer. */
 284         (void) buffer_get_int(&buffer);
 285         pub = key_new(KEY_RSA1);
 286         buffer_get_bignum(&buffer, pub->rsa->n);
 287         buffer_get_bignum(&buffer, pub->rsa->e);
 288         if (commentp)
 289                 *commentp = buffer_get_string(&buffer, NULL);
 290         /* The encrypted private part is not parsed by this function. */
 291
 292         buffer_free(&buffer);
 293         return pub;
 294 }
 295
 296 /* load public key from private-key file, works only for SSH v1 */
 297 Key *
 298 key_load_public_type(int type, const char *filename, char **commentp)
 299 {
 300         Key *pub;
 301         int fd;
 302
 303         if (type == KEY_RSA1) {
 304                 fd = open(filename, O_RDONLY);
 305                 if (fd < 0)
 306                         return NULL;
 307                 pub = key_load_public_rsa1(fd, filename, commentp);
 308                 close(fd);
 309                 return pub;
 310         }
 311         return NULL;
 312 }
 313
 314 /*
 315  * Loads the private key from the file.  Returns 0 if an error is encountered
 316  * (file does not exist or is not readable, or passphrase is bad). This
 317  * initializes the private key.
 318  * Assumes we are called under uid of the owner of the file.
 319  */
 320
 321 static Key *
 322 key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
 323     char **commentp)
 324 {
 325         int i, check1, check2, cipher_type;
 326         size_t len;
 327         Buffer buffer, decrypted;
 328         u_char *cp;
 329         CipherContext ciphercontext;
 330         Cipher *cipher;
 331         Key *prv = NULL;
 332         struct stat st;
 333
 334         if (fstat(fd, &st) < 0) {
 335                 error("fstat for key file %.200s failed: %.100s",
 336                     filename, strerror(errno));
 337                 close(fd);
 338                 return NULL;
 339         }
 340         if (st.st_size > 1*1024*1024) {
 341                 error("key file %.200s too large", filename);
 342                 close(fd);
 343                 return (NULL);
 344         }
 345         len = (size_t)st.st_size;               /* truncated */
 346
 347         buffer_init(&buffer);
 348         cp = buffer_append_space(&buffer, len);
 349
 350         if (read(fd, cp, (size_t) len) != (size_t) len) {
 351                 debug("Read from key file %.200s failed: %.100s", filename,
 352                     strerror(errno));
 353                 buffer_free(&buffer);
 354                 close(fd);
 355                 return NULL;
 356         }
 357
 358         /* Check that it is at least big enough to contain the ID string. */
 359         if (len < sizeof(authfile_id_string)) {
 360                 debug3("Not a RSA1 key file %.200s.", filename);
 361                 buffer_free(&buffer);
 362                 close(fd);
 363                 return NULL;
 364         }
 365         /*
 366          * Make sure it begins with the id string.  Consume the id string
 367          * from the buffer.
 368          */
 369         for (i = 0; i < sizeof(authfile_id_string); i++)
 370                 if (buffer_get_char(&buffer) != authfile_id_string[i]) {
 371                         debug3("Not a RSA1 key file %.200s.", filename);
 372                         buffer_free(&buffer);
 373                         close(fd);
 374                         return NULL;
 375                 }
 376
 377         /* Read cipher type. */
 378         cipher_type = buffer_get_char(&buffer);
 379         (void) buffer_get_int(&buffer); /* Reserved data. */
 380
 381         /* Read the public key from the buffer. */
 382         (void) buffer_get_int(&buffer);
 383         prv = key_new_private(KEY_RSA1);
 384
 385         buffer_get_bignum(&buffer, prv->rsa->n);
 386         buffer_get_bignum(&buffer, prv->rsa->e);
 387         if (commentp)
 388                 *commentp = buffer_get_string(&buffer, NULL);
 389         else
 390                 xfree(buffer_get_string(&buffer, NULL));
 391
 392         /* Check that it is a supported cipher. */
 393         cipher = cipher_by_number(cipher_type);
 394         if (cipher == NULL) {
 395                 debug("Unsupported cipher %d used in key file %.200s.",
 396                     cipher_type, filename);
 397                 buffer_free(&buffer);
 398                 goto fail;
 399         }
 400         /* Initialize space for decrypted data. */
 401         buffer_init(&decrypted);
 402         cp = buffer_append_space(&decrypted, buffer_len(&buffer));
 403
 404         /* Rest of the buffer is encrypted.  Decrypt it using the passphrase. */
 405         cipher_set_key_string(&ciphercontext, cipher, passphrase,
 406             CIPHER_DECRYPT);
 407         cipher_crypt(&ciphercontext, cp,
 408             buffer_ptr(&buffer), buffer_len(&buffer));
 409         cipher_cleanup(&ciphercontext);
 410         memset(&ciphercontext, 0, sizeof(ciphercontext));
 411         buffer_free(&buffer);
 412
 413         check1 = buffer_get_char(&decrypted);
 414         check2 = buffer_get_char(&decrypted);
 415         if (check1 != buffer_get_char(&decrypted) ||
 416             check2 != buffer_get_char(&decrypted)) {
 417                 if (strcmp(passphrase, "") != 0)
 418                         debug("Bad passphrase supplied for key file %.200s.",
 419                             filename);
 420                 /* Bad passphrase. */
 421                 buffer_free(&decrypted);
 422                 goto fail;
 423         }
 424         /* Read the rest of the private key. */
 425         buffer_get_bignum(&decrypted, prv->rsa->d);
 426         buffer_get_bignum(&decrypted, prv->rsa->iqmp);          /* u */
 427         /* in SSL and SSH v1 p and q are exchanged */
 428         buffer_get_bignum(&decrypted, prv->rsa->q);             /* p */
 429         buffer_get_bignum(&decrypted, prv->rsa->p);             /* q */
 430
 431         /* calculate p-1 and q-1 */
 432         rsa_generate_additional_parameters(prv->rsa);
 433
 434         buffer_free(&decrypted);
 435
 436         /* enable blinding */
 437         if (RSA_blinding_on(prv->rsa, NULL) != 1) {
 438                 error("key_load_private_rsa1: RSA_blinding_on failed");
 439                 goto fail;
 440         }
 441         close(fd);
 442         return prv;
 443
 444 fail:
 445         if (commentp)
 446                 xfree(*commentp);
 447         close(fd);
 448         key_free(prv);
 449         return NULL;
 450 }
 451
 452 Key *
 453 key_load_private_pem(int fd, int type, const char *passphrase,
 454     char **commentp)
 455 {
 456         FILE *fp;
 457         EVP_PKEY *pk = NULL;
 458         Key *prv = NULL;
 459         char *name = "<no key>";
 460
 461         fp = fdopen(fd, "r");
 462         if (fp == NULL) {
 463                 error("fdopen failed: %s", strerror(errno));
 464                 close(fd);
 465                 return NULL;
 466         }
 467         pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
 468         if (pk == NULL) {
 469                 debug("PEM_read_PrivateKey failed");
 470                 (void)ERR_get_error();
 471         } else if (pk->type == EVP_PKEY_RSA &&
 472             (type == KEY_UNSPEC||type==KEY_RSA)) {
 473                 prv = key_new(KEY_UNSPEC);
 474                 prv->rsa = EVP_PKEY_get1_RSA(pk);
 475                 prv->type = KEY_RSA;
 476                 name = "rsa w/o comment";
 477 #ifdef DEBUG_PK
 478                 RSA_print_fp(stderr, prv->rsa, 8);
 479 #endif
 480                 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
 481                         error("key_load_private_pem: RSA_blinding_on failed");
 482                         key_free(prv);
 483                         prv = NULL;
 484                 }
 485         } else if (pk->type == EVP_PKEY_DSA &&
 486             (type == KEY_UNSPEC||type==KEY_DSA)) {
 487                 prv = key_new(KEY_UNSPEC);
 488                 prv->dsa = EVP_PKEY_get1_DSA(pk);
 489                 prv->type = KEY_DSA;
 490                 name = "dsa w/o comment";
 491 #ifdef DEBUG_PK
 492                 DSA_print_fp(stderr, prv->dsa, 8);
 493 #endif
 494         } else {
 495                 error("PEM_read_PrivateKey: mismatch or "
 496                     "unknown EVP_PKEY save_type %d", pk->save_type);
 497         }
 498         fclose(fp);
 499         if (pk != NULL)
 500                 EVP_PKEY_free(pk);
 501         if (prv != NULL && commentp)
 502                 *commentp = xstrdup(name);
 503         debug("read PEM private key done: type %s",
 504             prv ? key_type(prv) : "<unknown>");
 505         return prv;
 506 }
 507
 508 static int
 509 key_perm_ok(int fd, const char *filename)
 510 {
 511         struct stat st;
 512
 513         if (fstat(fd, &st) < 0)
 514                 return 0;
 515         /*
 516          * if a key owned by the user is accessed, then we check the
 517          * permissions of the file. if the key owned by a different user,
 518          * then we don't care.
 519          */
 520 #ifdef HAVE_CYGWIN
 521         if (check_ntsec(filename))
 522 #endif
 523         if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
 524                 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
 525                 error("@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @");
 526                 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
 527                 error("Permissions 0%3.3o for '%s' are too open.",
 528                     (u_int)st.st_mode & 0777, filename);
 529                 error("It is recommended that your private key files are NOT accessible by others.");
 530                 error("This private key will be ignored.");
 531                 return 0;
 532         }
 533         return 1;
 534 }
 535
 536 Key *
 537 key_load_private_type(int type, const char *filename, const char *passphrase,
 538     char **commentp)
 539 {
 540         int fd;
 541
 542         fd = open(filename, O_RDONLY);
 543         if (fd < 0)
 544                 return NULL;
 545         if (!key_perm_ok(fd, filename)) {
 546                 error("bad permissions: ignore key: %s", filename);
 547                 close(fd);
 548                 return NULL;
 549         }
 550         switch (type) {
 551         case KEY_RSA1:
 552                 return key_load_private_rsa1(fd, filename, passphrase,
 553                     commentp);
 554                 /* closes fd */
 555                 break;
 556         case KEY_DSA:
 557         case KEY_RSA:
 558         case KEY_UNSPEC:
 559                 return key_load_private_pem(fd, type, passphrase, commentp);
 560                 /* closes fd */
 561                 break;
 562         default:
 563                 close(fd);
 564                 break;
 565         }
 566         return NULL;
 567 }
 568
 569 Key *
 570 key_load_private(const char *filename, const char *passphrase,
 571     char **commentp)
 572 {
 573         Key *pub, *prv;
 574         int fd;
 575
 576         fd = open(filename, O_RDONLY);
 577         if (fd < 0)
 578                 return NULL;
 579         if (!key_perm_ok(fd, filename)) {
 580                 error("bad permissions: ignore key: %s", filename);
 581                 close(fd);
 582                 return NULL;
 583         }
 584         pub = key_load_public_rsa1(fd, filename, commentp);
 585         lseek(fd, (off_t) 0, SEEK_SET);         /* rewind */
 586         if (pub == NULL) {
 587                 /* closes fd */
 588                 prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
 589                 /* use the filename as a comment for PEM */
 590                 if (commentp && prv)
 591                         *commentp = xstrdup(filename);
 592         } else {
 593                 /* it's a SSH v1 key if the public key part is readable */
 594                 key_free(pub);
 595                 /* closes fd */
 596                 prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
 597         }
 598         return prv;
 599 }
 600
 601 static int
 602 key_try_load_public(Key *k, const char *filename, char **commentp)
 603 {
 604         FILE *f;
 605         char line[SSH_MAX_PUBKEY_BYTES];
 606         char *cp;
 607         u_long linenum = 0;
 608
 609         f = fopen(filename, "r");
 610         if (f != NULL) {
 611                 while (read_keyfile_line(f, filename, line, sizeof(line),
 612                             &linenum) != -1) {
 613                         cp = line;
 614                         switch (*cp) {
 615                         case '#':
 616                         case '\n':
 617                         case '\0':
 618                                 continue;
 619                         }
 620                         /* Skip leading whitespace. */
 621                         for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
 622                                 ;
 623                         if (*cp) {
 624                                 if (key_read(k, &cp) == 1) {
 625                                         if (commentp)
 626                                                 *commentp=xstrdup(filename);
 627                                         fclose(f);
 628                                         return 1;
 629                                 }
 630                         }
 631                 }
 632                 fclose(f);
 633         }
 634         return 0;
 635 }
 636
 637 /* load public key from ssh v1 private or any pubkey file */
 638 Key *
 639 key_load_public(const char *filename, char **commentp)
 640 {
 641         Key *pub;
 642         char file[MAXPATHLEN];
 643
 644         /* try rsa1 private key */
 645         pub = key_load_public_type(KEY_RSA1, filename, commentp);
 646         if (pub != NULL)
 647                 return pub;
 648
 649         /* try rsa1 public key */
 650         pub = key_new(KEY_RSA1);
 651         if (key_try_load_public(pub, filename, commentp) == 1)
 652                 return pub;
 653         key_free(pub);
 654
 655         /* try ssh2 public key */
 656         pub = key_new(KEY_UNSPEC);
 657         if (key_try_load_public(pub, filename, commentp) == 1)
 658                 return pub;
 659         if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
 660             (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
 661             (key_try_load_public(pub, file, commentp) == 1))
 662                 return pub;
 663         key_free(pub);
 664         return NULL;
 665 }